Add pgm focus const

[Jun Aishima (JunAishima)]

Add this item from baseline, only the latter value (if more than 1).

Since similar values are already being put into the Nexus file (baseline, single value), no significant changes are necessary to handle it.

This has been shown to work for a couple of runs at the ARPES endstation in the truncated output:

...
88 -rwxr-x---+ 1 workflow-esm pass-320795 84913 Sep  3 15:12 T_0021.nxs
...
> h5ls -r T_0021.nxs

...
/entry/instrument/monochromator/c_value Dataset {SCALAR}
...

[Copilot]

🟢 Approval recommended

The functional change is small and consistent with existing metadata-export patterns; the only feedback is a minor formatting fix for readability.

Pull request overview

This PR extends the NeXus metadata export to include the PGM focus constant from baseline metadata and write it into the monochromator group (/entry/instrument/monochromator/c_value) in the output .nxs file.

Changes:

• Add PGM_Focus_Const to the baseline variables fetched from Tiled.
• If present, write PGM_Focus_Const into the NeXus file as entry/instrument/monochromator/c_value.

File summaries

File	Description
metadata_exporter.py	Reads PGM_Focus_Const from baseline and exports it into the NeXus monochromator group as c_value.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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[Copilot]

🟢 Approval recommended

The change is small and consistent with the existing metadata export pattern, with only a minor maintainability nit noted.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite